#include <stdio.h>
#include <stdlib.h>
int v[16001];
int n, k;
int ok(int c)
{
    int tr = 0, s = 0, i;
    for (i = 1; i <= n; i ++)
    {
        if (v[i] > c)
            return 0;
        s += v[i];
        if (s > c)
        {
            tr ++;
            s = v[i];
        }
    }
    if (s > 0)
        tr ++;
    return tr <= k;
}
int bs(int dr)
{
    int med, last = dr + 1, st;
    st = 1;
    while(st <= dr)
    {
        med = dr - ((dr - st) >> 1);
        if(ok(med)){
            last = med;
            dr = med - 1;
        }
        else
            st = med + 1;
    }
    return last;
}
int main()
{
    FILE *fin, *fout;
    fin = fopen("transport.in", "r");
    fout = fopen("transport.out", "w");
    int i, s = 0;
    fscanf(fin, "%d%d", &n, &k);
    for (i = 1; i <= n; i ++)
    {
        fscanf(fin, "%d", &v[i]);
        s += v[i];
    }
    fprintf(fout, "%d", bs(s));
    fclose(fin);
    fclose(fout);
    return 0;
}